Good Bluetooth USB Dongle on a computer with no built in Bluetooth?

Hi Everyone
What is a good external USB dongle to use to link up my new Apple bluetooth keyboard and magic mouse on my Mac Pro without built in Bluetooth?
Thanks

Probably most any usb bluetooth dongle will work.  I use a IOGear GBU421 (got it on sale at Fry's for about $9) but I believe the DLink DBT-120 is another populer one.  Mine is plugged into the back of my 27" LED so it's only a foot or two away from my magic mouse and trackpad.
Note, there are a few "gotchas" with these things. 
1. They are usb devices so if you sleep the machine the dongle is off too.  So you can't, for example, click a bluetooth mouse to wake your machine.  I wake my machine by clicking a key on my wired keyboard.
2. They don't always pair right away after waking up from sleep (at least mine doesn't).  You may have to flip the switch on the mouse to get your machine to notice it.    There is rarely a problem with the BT coming up after a (re)boot.
3. Depending on the model of mac pro, there may be some concern on whether plugging in a BT dongle disables the internal BT.  On late 2010 Mac Pro's like I have it does.  On earlier models I am not so sure and the internal card may have to be disconnected.  Since you don't have internal you don't have to worry about this.  I'm just mentioning this for others that may read this.
I guess I should answer the question on why one would stick a dongle onto a mac pro that has internal BT.  Mainly because for some, the BT on the mac pro s**ks!  IMO sticking an antenna inside and near the back of what amounts to a Faraday cage is not a bright idea.  End result, skipping mice (google it and see this thread and there could be other dongle suggestions in that thread as well), poor reception, and a lot of frustration.  Results vary depending on how far the mac pro is from the mouse, it's position, and what's between the back of the machine and the mouse.
4. Even if you use a BT mouse (with or without a dongle) I recommend always having a wired mouse as a backup (keboard too if you are using a BT keyboard).
5. If you are having pairing problems, the "standard" first attempt to fix is to do a smc and pram reset.  And if all else fails you can do a "factory reset" of BT and re-pair your BT devices.

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